Faradays Law in 3 minutes

PhysicsHigh · ⏱ 3:04 · 170.8K مشاهدة · 2 years ago

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what is Paradise law so when conductor is placed in magnetic field and that magnetic field changes and EMF is generated and if that conductor is loop it will induce also current so Faraday's law basically say that the magnitude of the EMF that is generated is proportional to the change of flux with respect to time so let's examine what this means by using model to represent our current bearing wire Loop like this so if place my Loop within magnetic field which in this case is going into the screen because flux is equal to the magnetic field strength multiplied by the area assuming the two are parallel to each other first can change the area so if increase the area then generate an EMF and induce current as demonstrated by the arrows another way could do this is can change the strength of the magnetic field so for example if increase the magnetic field strength generate an EMF and thus generate an induced current as shown now of course in both cases the EMF is proportional to the right at which the variables change but there is another way can also generate an EMF and that is by rotating my Loop of wire now since the area of the magnetic field passing through the loop changes as rotate it then we have rate of change of flux graphing it it looks like this but the EMF is proportional not to the flux with respect to time but to the rate of change or flux with respect to time so when the flux is academic maximum the flux isn't changing much in other words the rate of change of flux at that time is zero so we don't get an EMF however when flux is at minimum or zero the rate of change of flux in fact is at maximum and so as result we get maximum EMF and so if we graph this we get this but what about the negative symbol you ask well that's reference to lenses law lenses law in essence states that the direction of the induced EMF will be such that it opposes the change that generates it that means our EMF graph will now look like this finally what about the well have only one Loop here if have coil instead multiple Loops then each turn of that coil will increase the strength of the EMF that is generated so the stands for the number of turns within your coil so that is summary of Faraday's law finally want to acknowledge the input of Simon crook from crooked science for the inspiration for this video more information on the professional development he provides will be in the description below my name is Paul from physics High take care and bye for now